Answer:
light travels in straight line
Answer:
1.785 m/s
Explanation:
The momentum can be calculated using the expression below
M1 *V1 + M2 * V2 = (M1+M2) V3
M1= mass of van=9000 kg
M2= mass of car= 850kg
V3= velocity of entangled car
V1= Velocity of the van= 0
V2= velocity of the car= 5 m/ s
Substitute the values
(900×0) + (500×5)=( 900+500)× V3
2500=1400 V3
V3=2500/1400
V3= 1.785 m/s
Hence, velocity of the entangled cars after collision is 1.785 m/s
The kinetic energy of an object is given by:
KE = 0.5mv²
KE = kinetic energy, m = mass, v = speed
Given values:
KE = 0.161J, v = 2.33m/s
Plug in and solve for m:
0.161 = 0.5m(2.33)²
m = 0.059kg
Answer:
Time observed by the astronaut = 2.388 hours
Distance traveled be according to an observer on Earth = 1.27 × 10¹¹ m
Distance traveled according to the astronaut = 2.52 × 10¹² m
Explanation:
Given:
Speed of the astronaut, v = 0.980c
time = 12.0 hr
now, from the time dilation formula we have
here
t' is the time observed by the astronaut
c is the speed of the light = 3 × 10⁸ m/s
thus,
or
t' = 2.388 hours
Now,
Distance = Velocity × time
The distance traveled be according to an observer on Earth will be
Distance = 0.980c × ( 12 × 60 × 60 )
or
D = 0.980 × 3 × 10⁸ × ( 12 × 60 × 60 )
or
Distance = 1.27 × 10¹¹ m
And, The distance traveled according to the astronaut will be
Distance = velocity × t'
or
D = 0.980 × 3 × 10⁸ × ( 2.388 × 60 × 60 )
or
Distance = 2.52 × 10¹² m